Limit this to sufficiently advanced devices

Author: Lokathor

crates/core_arch/src/acle/registers/aarch32.rs

@@ -1,4 +1,5 @@
 /// Application Program Status Register
 pub struct APSR;
 
+#[cfg(any(not(target_feature = thumb-mode), target_feature = v6t2))]
 rsr!(APSR);